The basic oil seal is made of rubber, iron shell and spring. The main function of the oil seal is to block the outflow of internal liquid and the entry of external dirt. Generally, oil leakage or dirt flows in from the gap between the oil seal and the shaft. Oil seals of standard design are widely used in vehicles and various industrial applications. They are divided into many different types. They are generally used in pressureless or pressurized fluid seals and severe grease sealing conditions. With iron parts, the structure is strengthened. The outer diameter Rubber-covered design enhances sealing capabilities.